Atavism

At·a·vism

Atavism

n.
  1. The recurrence, or a tendency to a recurrence, of the original type of a species in the progeny of its varieties; resemblance to remote rather than to near ancestors; reversion to the original form. (Biol.)
    Now and then there occur cases of what physiologists call atavism, or reversion to an ancestral type of character.
  2. recurrence of or reversion to a past style, outlook, approach, or manner.